Trip mechanism for knitting-machine stop motions



July 24,1928. 1,678,557

A. CRAWFORD V TRIP MECHANISM FOR KNITTING MACHINE STOP MOTIONS FiledApril 13, 1926 Izvavfir zww Patented July 24, 1928.

ALFRED, CRAWFORD, or NEW isnunswrox, new annsnxnssrenon TQ CRAWFORD newnnun'swron, NEW

MANUFACTURING COMPANY, or TION or NEW JERSEY.

E TOFFICE- JERSEY, A CORPORA- rnrr mnonnnisivr roa KnITrrnevracnmnsrorMOTIONS.

Application filed April 13, 1926. se iai'ua. 101,739.

Theobject "of my invention is to provide a simple and efiicient meansfor tripping the stop, motion of a knitting machine when the knittingthread breaks or runs out of the thread guides thereof whenthe thread onthe cone becomes exhausted and for absorbing the vibrations in thethreadofthe knitting machine, to prevent whipping and tanghng of the knittingthread.

=The advantages and construction will be disclosed in detail hereinafterreference being hadto the accompanying drawing of which: f I

Fig. 1 is aflperspective View of my improved tri'pping mechanismillustrated n normal running position; Fig. 2 is a view similar to Fig.1 illustrating the tripping mechanism in an operative or trippingposition; l

g Fig. 3 is a side elevation of the trip-ping device in a positionsimilar to that illus- ;trated'in Fig. 1; and

' Fig. 4 is a perspective view of a detail of fthe invention I IReferring to the drawing. 1 indicates a supporting arm having a base 2adapted to be secured tothe body of a. stop motion (not shown) formingno part of the present invention. The outer end of the arm 1 is:provided with'a downwardly extending bearing 3 in which and the base 2is journaled a trip shaft 4,which is provided at its inner end with atrip crank 5 adapted to co -o'per ate with the said stop motion to tripit when the shaft4isroc-kedclockwise.

A bracket 6 extends vertically from the ofr'said arm, and this. bracketis provided with'a horizontally extending flange 7 lying adjacent. thetop of the arm l and secured thereto by means of screws 8,8 (Fig. 3).

[The bracket 6 is provided with lugs 10, '11 and 12 which are adapted toreceive threadeyes'13, 14 and 15 respectively of porcelain or otherequally hard material adapted to resist. the wearing tendencies created.by the running thread w in itspassage from the cone, through said eyes,to the needles of the knitting machine to whichthe device is attached.

The bracket 6 is provided with asecon'd pair of lugs 16 and 17 adaptedto receive a vertically extending spindle18 which is suitably secured toa gate element 19. Thegate element 19 is providedadjacent'its lower endstantially parallel to the plane of the bracket 16 but indifl'ere'n'tplafr'ies, one with respect to v the other. it

for the accommodation of the arms 20 The bracket 6 is apertured at 22and 21.

Secured to theouter endof the trip shaft weighted trip arm comprisingavhub 23-, secured to said shaft 4..andyan upwardly extending arm 24which lies inaplane substantially parallelt o the? bracket 6 and occupes a position behind the arm 21 and in 'front of'thearin 20 of thegateelement 19.

On the upper end oflthe-arm .2 1 is a weight'jmember in the fo'rm' of aplate 25, Ywhichis-secured to-the arm 2 15 and extendsoutwardlytherefromyand is provided with a pair of arms26, 26. These arms26 lie in a planesubstantiallyparallelto the bracket '6 and "are-bentoutwardly therefrom adjacent their outer ends andflthen inwardly towardsaid bracket, the ends of said arms extending into apertures; 27. 27 in"the bracket 6? i thereof; and the ends of thearms 26; 26 extend into theapertures 27,27 in the bracket' 6 to prevent the release ofthe threadfrom the crook 28, 2 v V The" upper end of the gate element 19 isprovided with an outwardly extending resilient arni30 which may besecured to said gate nember in any suitable manner and in the presentinstance by means of lugs 31, 31 formed integral with the gate 19 andturned upon the one end-of the resilient arm 30 and "upon themselves torigidly secure the said arm to the gate element, as shown in thedrawing."

The arm 30' lies in a plane substantially parallel to the planeofthe'bracket (land the outer end thereof occupies a positionintermediate the thread eyes 18' and'l and behindthe running thread 00.The said'outer end i's'con'vexed' from the plane of the preventinglashing 1, adjacent the bearing 3 of the arm 1, is a said bracket asillustratedat 32 in order to edges," to the said running thread.

present a rounded'surface, free of all sharp iAs viewed from the outerendof the arin 1 the trip-shaft 4 isjournaled at the'centre 55 withapairof arms 20 and 21 which lie sub- I of said arm and the trip arm 24 liesin aadapted to engage said thread intermediate verticalplane adjacentthe right side of the said supporting arm. This arrangement throws thecentre of gravity of the trip arm at the right hand side of its centreof rotation.

Under normal operating conditions the thread a: passes through thethread eyes 13, st and 15, the resilient arm lies between the thread 00and the face of the bracket 6. The arms 26 occupy positions outside thethread m and the arm 2% lies between the arms and 21 of the gate element19, all as clearly illustrated in Fig. 1.

The weight 25 is retained in position by the resilient arm lying behindthe thread 00 and in event of the failure of the thread .90, theresilient arm 30 is released, permitting the gate element 19 .to turnand the weight 25 to move outward from the bracket 6, due to its offbalance centre of gravity, the arm 24: engaging the back side of the arm21. The arm 24 continues to move in a clockwise direction, turning thetrip shaft r 4 and the trip crank 5'until the stop motion controlledthereby is operated to stop the knitting machine.

The resilient arm 30 absorbs any vibrations set up by the machine whichwould cause the thread to whip or lash and become tangled around thethread guides.

The bracket 6 is provided with a pair of arms 34 and 35 which extendparallel to the resilient arm 30 above and below the same to protectthis delicate arm from accidental in- 1 If is to be understood that thepreferred embodiment of my invention is shown in the drawing, this formbeing selected for the purpose of illustration and, therefore, shouldnot be construed as limiting the scope of my invention, the device beingcapable of considerable modification and only such limitations should beplaced thereon as are prescribed by the appended claims or as may bedictated by the prior art of record.

1 claim:

1. In tripping mechanism for knitting machine stop motions, thecombination of thread eyes for guidin the knitting thread; a rotatabletrip shaft for controlling the operati on of said-stop motion; aweighted arm secured to andyadapted to rotate said trip shaft; and aresilient arm adapted to control the rotation of said trip shaft and toabsorb the vibrations on said thread between said thread eyes.

2. In tripping mechanism for knitting machine stop motions, thecombination of a rotatable trip shaft; a weighted arm secured to andadapted to rotate said trip shaft; means for maintaining said tripshaftand said weighted! armln their inoperative positions; thread eyes forthe knitting thread;

and a resilient arm on said retaining means said thread eyes formaintaining said retaining means in its operative position.

3. In trippi mechanism for knitting machine stop mot-ions, thecon'ibination of a rotatable trip shaft; a weighted arm secured to saidtrip shaft; a gate element for retaining said weighted arm in aninoperative position; thread eyes for the knitting thread; and aresilient arm on said gate element ada ated to en a e said knittinthread intermediate said thread eyes. for maintaining said gate elementin its operative position;

4. In tripping mechanism for knitting machine stop motions, thecombination of a supporting arm; a trip shaft'on said'supporting-..

arm; a weighted arm on said trip shaft; a bracket on said supporting armagate element pivoted to said bracket and adapted to engage saidweighted arm; thread eyeson said bracket; a resilient arm on said gateelement adapted to engage the knitting thread. intermediate said threadeyes.

5. In tripping mechanism for knitting machine stop motions, thecombination of a-supporting arm; a trip shaft longitudinally,

journaled in said supporting arm; substantially at the centre thereof; abracket secured to saidsupporting arm contiguous with one side thereof;a weighted arm on said trip shaft and lying in a plane adjacent saidbracket; a gate element pivoted to said bracket and adapted to engagesaid weighted arm; thread guides on said bracket; and a resilient arm onsaid gate element adapted to engage'the knitting thread intermediatesaid thread guides.

6. ln tripping mechanism for knittlng machine stop motions, thecombination of a supporting arm; a trip "shaft on said supporting arm; aweighted arm on said trip shaft; a bracket on said supporting arm;thread eyes on said bracket; a gate element pivoted on said bracket; anarm on said gate element adapted to engage said weighted arm at one sidethereof; a second arm on said gate element, adapted to; engage saidweighted armon the opposite side thereof;

; a resilient arm on said gate element adapted to engage the. knittingthread intermediate the thread eyes v Q 7. In tripping mechanism forknitting machine stop motions, the combination of a supporting arm; abracketonsaid supporting arm; thread eyes on said bracket; a trip shafton said supporting-arm; a weighted I arm on said .t-rip shaft; arms -onsaid weighted arm; crooks in said armsaligned with said thread eyes; agate element pivoted on said bracket and adapted to engage said weightedarm; and a resilient arm on said gate element and adapted to engagetheknitting thread intermediate said thread eyes.

8. In tripping mechanism for knitting machine stop motions, thecombination of, a

supporting arm; a trip shaft on said supportlng arm; a bracket on Sitldsupporting arm;

thread eyes on said bracket; a resilient arm' pivoted to said bracket,adapted to engage the knitting thread intermediate said thread eyes andto control the operation of said trip shaft; and arms integral with saidbracket and lying at either side of said resilient arm, for theprotection thereof.

9. In tripping mechanism for knitting maehine stop motions, thecombination of thread guides; a trip shaft; means inter mediate thethread runningin said thread guides and. said trip shaft for controllingtheoperation thereof when said thread breaks and including a resilientarm, comprising a substantially flat spring adapted toengage said threadintermediate said thread guides; and a convexed portion adjacent one endthereof adapted to present a rounded smooth 20 surface to the runningthread.

ALFRED CRAWVFORD.

